<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>家庭作业0810</title>
    <script src="js/jquery.min.js"></script>
</head>
<body>
    <h3>短信发送倒计时</h3>
    <div class="phone">
        手机号:<input type="text"/><button>发送</button>
    </div>
</body>
<script src="js/homework.js"></script>
</html>